[mlir][Linalg][Python] Create the body of builtin named Linalg ops

This revision adds support to properly add the body of registered
builtin named linalg ops.
At this time, indexing_map and iterator_type support is still
missing so the op is not executable yet.

Differential Revision: https://reviews.llvm.org/D99578

mlir/lib/Bindings/Python/MainModule.cpp

@@ -10,6 +10,7 @@
 
 #include "PybindUtils.h"
 
+#include "DialectLinalg.h"
 #include "ExecutionEngine.h"
 #include "Globals.h"
 #include "IRModule.h"
@@ -225,4 +226,9 @@ PYBIND11_MODULE(_mlir, m) {
   auto executionEngineModule =
       m.def_submodule("execution_engine", "MLIR JIT Execution Engine");
   populateExecutionEngineSubmodule(executionEngineModule);
+
+  // Define and populate Linalg submodule.
+  auto dialectsModule = m.def_submodule("dialects");
+  auto linalgModule = dialectsModule.def_submodule("linalg");
+  populateDialectLinalgSubmodule(linalgModule);
 }